CVE-2026-54257 — Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.1 until 42.3.3, Buffer performs incorrect byte length calculati…
Published: 2026-06-23 · CVSS: 9.3 · CVSS 4.0
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.1 until 42.3.3, Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow. Most apps will crash and some may perform incorrect buffer allocations in the Node.js Buffer API resulting in unexpected truncation or allocation. This vulnerability is fixed in 42.3.3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7